import java.util.*;

public class demo {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * @param str string字符串 待判断的字符串
     * @return bool布尔型
     */
    public boolean judge (String str) {
        // write code here
        int left = 0;
        int right = str.length() - 1;
        while(left <= right) {
            if(str.charAt(left) != str.charAt(right))
                return false;
            left++;
            right--;
        }
        return true;
    }

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String s = scan.;

    }
}